Kinetics-Controlled Interfacial Synthesis of Janus and Patchy Heterostructures Based on Perovskite Nanocrystals

摘要

Heterostructures integrated by diverse material featuring nanocrystals (NCs)tunable properties and functions are of great interest. However, to rationallydesign and precisely control the heterostructures in multiple shapesstill remains a tremendous challenge. In this work, the nucleation of SiO_2nanoparticles is manipulated via a kinetics-controlled water–hexane interfacialreaction system to construct Cs_3Cu_2I_5/SiO_2 heterostructures, which canbe well controlled in Janus and patchy morphology. In this interfacial reaction,the evolution of Cs_3Cu_2I_5 NCs and the intrinsic formation mechanismof the heterostructures are investigated. It is observed that the Cs_3Cu_2I_5 NCson the interface undergo a morphology transformation driven by ligand lossand exposed facets evolution. Increased wettability between Cs_3Cu_2I_5 andSiO_2 favors the formation of Cs_3Cu_2I_5/SiO_2 heterostructures. The key to thisstrategy is to break the rule of thermodynamic domination in reaction bykinetics manipulation when constructing the patchy heterostructure. To benoted, an increased stability is conferred on the resultant heterostructureproduct compared to naked perovskite NCs. This work enables to bettercontrol the complicated heterostructure configurations and understand theirformation mechanism.